![]() However, the lap splice length shall not be less than 36db. Providing a #3 or larger bar transverse to the lapped bars and within 8” from each end of the lap splice allows the lap splice length to be reduced by the confinement reinforcement factor per equation below. Lap splice lengths can be reduced if the lap splice is properly confined by transverse reinforcement per TMS 402. #5 Masonry Wall Schedule with LAP Lengths Confinement of Reinforcement #4 Old method comparison for Development Lengths, Bars Each Face #3 Old method comparison for Development Lengths, Bars Centered #2 Developement Length Table – Based on TMS 402 and IBC #1 Development Length Table – Based on TMS 402 Equation 6-1 K = minimum ( cover, clear spacing, 9 x db ) � = 1.0 for bars #3-#5 – 1.3 for bars #6-#7 – 1.5 for bars #8 and larger reinforcement Ld = length of reinforcement development or splice length This article hopes to clarify tips to consider while calculating lap splice (or development) lengths, and best practices for detailing lap lengths on design drawings.Īccording to the masonry code, TMS 402 Building Code Requirements for Masonry Structures (formerly MSJC), development length of reinforcement shall be the minimum of 12 inches or the length calculated by the following equation: However, designers must also ensure the proper transfer of stresses from one bar to another within the lap splice. The longer the lap, the more labor costs are incurred. When a project utilizes typical masonry closed-end masonry block, mason contractors will need to lift blocks over the vertical bar that projects above the bottom courses to lap with vertical bars above. Lap splice lengths for reinforcement on masonry projects are an important specification to consider on design drawings. ![]() When a project utilizes a typical masonry closed-end masonry block, mason contractors will need to lift blocks over the vertical bar that projects above the bottom courses to lap with vertical bars above. Masonry Lap Lengths Reinforcement Masonry Lap Lengths
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